Two-hole ground state: Dichotomy in pairing symmetry

JY Zhao, SA Chen, HK Zhang, ZY Weng - Physical Review X, 2022 - APS
A single-hole ground state Ansatz for the two-dimensional tJ model has been recently
studied by the variational Monte Carlo (VMC) method. Such a doped hole behaves like a …

Sign structure of the model and its physical consequences

X Lu, JX Zhang, SS Gong, DN Sheng, ZY Weng - Physical Review B, 2024 - APS
Understanding the doped Mott insulator is a central challenge in condensed matter physics.
In this work, we first explicitly identify a new sign structure in the tt′-J model on the square …

Phase diagram of the square-lattice model for electron-doped cuprates

Q Chen, L Qiao, F Zhang, Z Zhu - Physical Review B, 2024 - APS
Motivated by significant discrepancies between experimental observations of electron-
doped cuprates and numerical results of the Hubbard and tJ models, we investigate the role …

Mottness, phase string, and high-T c superconductivity

JY Zhao, ZY Weng - Chinese Physics B, 2022 - iopscience.iop.org
It is a great discovery in physics of the twentieth century that the elementary particles in
nature are dictated by gauge forces, characterized by a nonintegrable phase factor that an …